Loans - Allowances for Loan Losses and Ending Balances by Portfolio Class and Based on Impairment Method (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		$ 4
Allowance for loan losses collectively evaluated for impairment		6,834
Total ending allowance balance	$ 6,691	6,838
Loans individually evaluated for impairment		1,036
Loans collectively evaluated for impairment		625,922
Total ending loans balance		626,958
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment		1,110
Total ending allowance balance		1,110
Loans individually evaluated for impairment		123
Loans collectively evaluated for impairment		129,220
Total ending loans balance		129,343
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment		2,760
Total ending allowance balance		2,760
Loans individually evaluated for impairment		113
Loans collectively evaluated for impairment		231,672
Total ending loans balance		231,785
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment		1,268
Total ending allowance balance		1,268
Loans individually evaluated for impairment		677
Loans collectively evaluated for impairment		193,448
Total ending loans balance		194,125
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment		803
Total ending allowance balance		803
Loans collectively evaluated for impairment		55,318
Total ending loans balance		55,318
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		4
Allowance for loan losses collectively evaluated for impairment		229
Total ending allowance balance		233
Loans individually evaluated for impairment		123
Loans collectively evaluated for impairment		16,264
Total ending loans balance		16,387
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment		664
Total ending allowance balance		$ 664

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Section 50
-Paragraph 11B
-Subparagraph (g)
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-Topic 310
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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